Improvement in device for grinding- edged tools



N FETERS, FHDTaLITHOGNAPHER WASHINGTON u c H.1 ;.,frnns1; or BEA-VER'DAM, WISCONSIN.

` v Latas Patent No. 88,679, ma 11ml c, 1869.

IMPROVEMENT IN DEVICE FOR GRINDING EDG-ED TOOLS.

To all lwhom it ana/y concern Be Vit known that I, HQK. TRAsK, of thecity of Beaver Dam, in the county of Dodge, in the State ofWisconsin,'have invented a new and improved Mode of Holding Edged Toolson Gn'ndstones; and I du hereby declare that the following is a fullnandexact description thereof', reference being had fr to'tlie accompanyingdrawings, and to the lettersof reference marked thereon,.the sameletters referring to similar parts of the machine. Y l

The nature of my invention consists in providing a grindstone with anadjustable frame to hold the edged tools upon the stone, thus requiringthe labor of but oneperson to dc the grinding.

p, To enable others skilled in the art to 4make and use my invention, Iwill proceed to describe its construction and operation.

' This frame consists of two side-pieces .A A, in the figure, about aninch square, and of a length depending upon the diameter of the stone,made of any suit able material, and also twol end-pieces E E, in thefigire, fastened between the side-pieces, as shown in the gure.

There are also four strips B B B B, two attached to each side-piece A A,as in the ligure, so as to strike when raised, against the end-pieces EE, and be' held at any desired angle. y

These strips have holes about one-half inch apart, as shown in thefigure. Through these holes passes .a rod, or rods, as shown in thefigure.

This frame has also pin, or screw-holes in the end, as at E', for thepurpose of fastening the frame to a post standing against, and fastenedto the end of the grindstone-frame, as shown in the ligure.

The operationof the frame is as follows The frame being placed over thestone, and fastened by one end to the-post, as in the figure, the toolcan be placedunder the rod, with the edge resting upon the stone, andthe opposite part upon E E.

This rod can be placed higher up or lower down in the strips, so as togive any desired bevel to the edge ofthe tool.

Theunfastened end of the frame can be swung to and fro while the stoneis turned, thus bringing every part of the edge, whether circular orstraight, :in contact with the stone, and preserving the same bevel.-

Plane-irons, chisels, axes, hatchets, and manyother b'evelled tools canbe ground in this manner, with perfect ease by one person, and a moreperfect bevel can be obtained, even by an inexperienced grinder, than inany other way. l

If the weight of the frame does not give sufficient pressure upon thetool, the hand can be placed upon the free end of the frame, or a smallweight placed upon it.- 1

For grinding scythes, hay-knives, sickle-bars, drawshaves, 86e., thewhole ame must be elevated, so as to be even with the top of the stone.These toolscan then be passed under the frame, and over the stone, the

back of the tool resting against the peg H, to prevent.

its slipping.

These pegs H H are movable, so that any desired bevel can be given tothe tools.

-When the frame is in this position, its end must be securely fastenedto the post to prevent its swinging.-

If the Vframe be lowered, and the rod placed in the upper holesof thestrips, so that the rod will rest upon the upper part of the stone, manytools and instruments of steel or iron, whose thinness or elasticityrenders them very dilcult to be ground, can be ground with perfect easeand pleasure, the rod resting upon the article to be ground, exactlyabove the point of contact with the stone. I

In this manner one person can grind or polish many articles with thegreatest ease, which would be very diiicult for two in any other way.

What I claim as my invention, and desire to secure `by Letters Patent,is-

The combination of the swinging bars B, having the adjustable pins, withthe pieces E, and frame A, arranged and applied to a grindstone, in themanner described for the purposes specified.

H. K. TRASK.

Witnesses: i

lS. V. BnoBsr THEO. B. OATLIN.

